Wu Qing
5021fe665e
功能: v2.1 可观测性与流控 (#47)
* 功能: v2.1 可观测性与流控 — Prometheus + 节点带宽 + 审计 Webhook
核心能力：
- Prometheus /metrics 端点：11 类指标（任务/存储/节点/SLA/验证/恢复/复制）
- 节点级带宽限速生效：model.Node.BandwidthLimit 覆盖全局默认
- 审计日志 Webhook 外输：HMAC-SHA256 签名，配合 SIEM 合规留档
实现：
- server/internal/metrics/ 独立 Registry + 异步 Gauge Collector(30s)
- backup/restore/verify/replication 服务注入 metrics 钩子，nil 安全
- resolveProviderForNode() 按 task.NodeID 解析 BandwidthLimit
- AuditService.SetWebhook + 动态 settings 推送，无需重启
测试：
- metrics/registry_test.go: 注册/采集/nil safety/HTTP handler
- service/audit_service_webhook_test.go: 签名正确性/异步投递/禁用路径
- go test ./... 全部通过
* chore: 触发 CodeQL 扫描
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